Attendorf is a former municipality in the district of Graz-Umgebung, in the Austrian state of Styria. It lies in the federal province of Styria in southeastern Austria, within the Graz-Umgebung district that surrounds the city of Graz.
Since the 2015 Styria municipal structural reform, Attendorf is no longer an independent municipality; it is now part of the municipality of Hitzendorf. The reform reorganized municipal boundaries across Styria, merging a number of smaller communes into larger administrative units.